Re: 2.6.1 slower than 2.4, smp/scsi/sw-raid/reiserfs

Philip Martin
2004-02-03T01:01:55Z

Andrew Morton <akpm@osdl.org> writes:

> Nick Piggin <piggin@cyberone.com.au> wrote:
>>
>> Andrew, any other ideas?
>
> There seems to be a lot more writeout happening.

As far as I can see (and hear!) that's true.

> You could try setting /proc/sys/vm/dirty_ratio to 60 and
> /proc/sys/vm/dirty_background_ratio to 40.

Not much different:

2.6.1 (without elevator=deadline)

dirty_ratio:60 dirty_background_ratio:40

245.58user 121.82system 3:31.79elapsed 173%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+3771340minor)pagefaults 0swaps

dirty_ratio:40 dirty_background_ratio:10 (the defaults)

245.75user 121.33system 3:35.13elapsed 170%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+3770826minor)pagefaults 0swaps

--
Philip Martin